import type { EntitySchema } from '@mostajs/orm';
import type { ITransport, TransportConfig, TransportInfo, TransportMiddleware } from '../core/types.js';
import type { ServerResponse } from 'http';
/**
 * SSETransport streams entity change events to clients via Server-Sent Events.
 *
 * Clients connect to GET /events (or configured path) and receive:
 *   event: entity.created
 *   data: {"entity":"User","data":{...}}
 *
 *   event: entity.updated
 *   data: {"entity":"User","id":"123","data":{...}}
 *
 *   event: entity.deleted
 *   data: {"entity":"User","id":"123"}
 */
export declare class SSETransport implements ITransport {
    readonly name = "sse";
    private config;
    private schemas;
    private middlewares;
    private clients;
    private stats;
    use(middleware: TransportMiddleware): void;
    registerEntity(schema: EntitySchema): void;
    start(config: TransportConfig): Promise<void>;
    stop(): Promise<void>;
    getInfo(): TransportInfo;
    /** Get the SSE path for Fastify route registration */
    getPath(): string;
    /** Get connected client count */
    getClientCount(): number;
    /**
     * Handle a new SSE client connection.
     * Called by the server when a GET request arrives at the SSE path.
     */
    addClient(res: ServerResponse): void;
    /**
     * Broadcast an event to all connected SSE clients.
     * Called by the server when EntityService emits change events.
     */
    broadcast(eventName: string, data: Record<string, unknown>): void;
}
/** Factory function */
export declare function createTransport(): ITransport;